ABB ACH550-BCR, User Manual

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ACH550-UH User’s Manual 1-115
Parameters
Group 20: LIMITS
This group defines minimum and maximum limits to follow in driving the motor –
speed, frequency, current, torque, etc.
Group 20: Limits
Code Description Range Resolution Default S
2001
MINIMUM SPEED -30000…30000 rpm 1 rpm 0 rpm

Defines the minimum speed (rpm) allowed.
• A positive (or zero) minimum speed value defines two ranges,
one positive and one negative.
• A negative minimum speed value defines one speed range.
• See the figure.
2002
MAXIMUM SPEED 0…30000 rpm 1 rpm 1800 (US)

Defines the maximum speed (rpm) allowed.
2003
MAX CURRENT 0.0… 1.3 • I
2n
0.1 A 1.3 • I
2n

Defines the maximum output current (A) supplied by the drive to the motor.
2006
UNDERVOLT CTRL 0…2 1 1 [
ENABLE
(
TIME
)]
Sets the DC undervoltage controller on or off. When on:
• If the DC bus voltage drops due to loss of input power, the undervoltage controller decreases the motor speed in
order to keep the DC bus voltage above the lower limit.
• When the motor speed decreases, the inertia of the load causes regeneration back into the drive, keeping the DC
bus charged and preventing an undervoltage trip.
• The DC undervoltage controller increases power loss ride-through on systems with a high inertia, such as a
centrifuge or a fan.
0 =
DISABLE
– Disables controller.
1 =
ENABLE
(
TIME
) – Enables controller with 500 ms time limit for operation.
2 =
ENABLE
– Enables controller without maximum time limit for operation.
P 2001
P 2002
Speed
-(P 2001)
-(P 2002)
P 2002
P 2001
Speed range allowed
Speed range allowed
Speed range allowed
Time
Speed
Time
2001 value is > 0
0
0
2001 value is < 0